igi6. Arca [Anadara) granosa Annandale & Kemp, Mem. Ind. Mus., V, p. 350. 



1917. Arca granosa Odhner, Kungl. Sv. Akad. Handl. LII (N" 16), p. 8. 



1918. Arca granosa Annandale, Mem. Asiat. Soc. Bengal, VI, p. 318. 



1925. Arca [Scapharca) granosa Oostingh, Comm. Geol. Inst. Agri. Univ. Wageningen, N" 9, p. 235. 



Lamy dealt with the synonymy of this variable species in détail ; I hâve carefully checked 

 his conclusions and the synonymy given above represents the views of the earlier authors in 

 référence to this form. The species is widely distributed in the Indo-Pacific Area and often 

 occurs in estuarine areas : in such localities it has so far been recorded from the Chilka Lake, 

 the Gangetic Delta, Bassein River, India and Burma ; Singapore, Malay Peninsula ; varions 

 localities in the Sunda Islands ; and China. 



Distribution: — A. granosa has been recorded from Ja'pan in the north to Timor in the 

 south and westwards from the Malay Peninsula along the coasts of India to Bombay. 



In the "Siboga" collection it is represented by a single right valve (50 mm. long) from 

 the Bay of Labuan Tring, West Coast of Lombok (St. 19), a shell from Coral Slope in the 

 Bay of Bima (St. 47'^) and a young shell from Buton Strait (St. 207). 



6. Arca [Ajiadara) lischkei (Dunker). 



1868. Anomalocardia Lischkei Dunker, Novitat. Conch. Moll. Mar., p. 115, pi. XXXVIII, 

 figs. 14 — 16. 



1890. Anomalocardia Lischkei Paetel, Cat. Conch. Samm., III. p. 215. 



1891. Arca [Anomalocardia) Lischkei Kobelt in Martini Chemn. Conch. -Cab. (N. F.), VIII (2), 



Arca, p. 185, pi. XLV, figs. 7, 8. 

 1906 Arca lischkei Owston, Japan. Loochooan Shells, p. 33. 

 1907. Arca [Anadara] Lischkei Lamy, Journ. Conchylioi., LV, p. 243. 

 191 I. Arca [Aiiadara) Lischkei Pelseneer, "Siboga" Lamellibranches (Anat.), pp. 9, 12, 14. 



A. lischkei, as Lamy has pointed out, appears to be closely allied to A. cornea Reeve. 

 It is distinguished by its oblique, greatly inflated shells having 29 — 30 radial ribs, which are 

 almost smooth on the right and markedly ridged on the left valve \ the umbones are prominent 

 and greatly curved inwards and forwards. I agrée with Lamy (Op. cit., pp. 246, 247) that the 

 Sydney Mud-cockle figured by Hedley ^) under this name is A. Irapezia Deshayes. 



Distribution : — The species was described by Dunker from shells of unknovvn habitat. 

 Lamy referred a shell from the Andamans to this species. 



In the "Siboga" collection there is a complète shell (Length 57 mm., height 46.5 mm., 

 diameter 45.8 mm.) from the Anchorage off Beo, Karakelang Island (St. 131) and a right valve 

 from the Bay of Labuan Tring, West Coast of Lombok (St. 19). 



7. Arca {^Anadara) ehrenbergi (Dunker). 



1817. Arche Savigny, Descr. Egypt. Moll., pi. X, figs. 9, i — 3. 



1827. Arca antiquata Audouin (non Linn.), Expl. des pi. de Savigny, p. 203. 



1865. Arca sp. Vaillant, Journ. Conchylioi., XIII, p. 116. 



1868. Anomalocardia Ehrenbergi Dunker, Novitat. Conch., Moll. Mar., p. 116, pi. XXXVIII, 



figs. 17, 18. 



1869. Arca [Anomalocardia) Ehrenbergi Issel, Malacol. Mar. Rosso, pp. 91, 258. 

 1871, Arca Pharaonis Fischer, P., Journ. Conchylioi., XIX, p. 213. 



i) Hedley, C. — Pioc. Linn. Soc. N.S. Wales, XXIX, p. 203, pi. IX, figs. 29—34 (1904). 



